Tone-purifier.



No. 872,592- PATENTED DEC. 3, 1907. A. T. E. WANGEMANN.

TONE PURIFIER.

APPLIOATION FILED SEPT. 0,1905.

IQ if! Inventor:

mm X. wfi Atty 3 SHEETS-SHEET 1.

No. 872,592. PATENTED DEC. 3, 1907.

A. T. B. WANGEMANN.

. TONE PURIFIER.

Attest: Inventor M. '44 f #w I dBIIEETB-BHBBT 2.

PATENTED DEC. 3, 1907.

A. T. E. WANGEMANN.

- TONE PURIPIER.

APPLICATION rum) SEPT. 9.1905.

3 SHEETS-SHEET 3.

- UNITED STATES PATENT OFFICE.

ADELBERT THEO EDWARD WANGEMANN, OF WEST ORANGE, NEW JERSEY, ASSIGNOR TO NEW JERSEY PATENT COMPANY, OF WEST ORANGE, NEW JERSEY, A CORPORATION OF NEW JERSEY.

'rona-romrmn.

Patented Dec. 3, 1907.

Application filed September 9. 1905. Serial No, 277.801.

To all whom it may concern:

the direct and produce an un leasant'effect,

Be it known that I, ADELBERT THEO Ena rumbling sound; they inte ere constantly WARD WANGEMANN a citizen of the United States, residing at West Orange, in the county of Essex and State of New Jersey, have invented certain new and useful Improvements in Tone-Purifiers, of which the following is a descri tion.

My invention re ates to devices for purifying or improving the qualit Y of tones roduced by an instrument such as an Edlson phonograph or other talking machine, and mav be used also for recording pur oses with such instruments for improving tiie quality of the record.

It is well known that in order to produce natural sounds, practically all the sound waves produced at a given time should reach the car at the same instant. If, for example, a person is listenin to a speaker or singer in a lar e hall, the waves will, of course, travel directly to the listener, but there will also be a reflection of sound waves from the walls of the room which reach the listener somewhat later and a few of these wave-others will travel and be reflected so often and be in consequence so weakened that their influence on the spoken word or the tones of music are nullified yet these reflected waves have an influence on the understanding of the more direct sound waves which reached the listener first. The reflected waves plus the direct waves give to every such room or s ace its own tone of resonance, its own pccu iar character. Now in the case of phonographic reproduction, my belief is that the reproducer diaphragm emits from the sound box waves traveling in almost every direction, so that two principal classes of waves issue therefrom into the resonating horn, namely, those which travel in a direction parallel or slightly inclined to the axis of the horn, which travel for a considerable distance without reflection and which may be called direct waves, and those whose tion is longer than that of the direct vibra tions, they will reach the listener later than with the succeeding direct waves and cover up or destroy or counteract the same.

My invention has for its object the provision of means which furnish an easy outlet for direct waves and hinder or obstruct the assage of cross vibrations, whereby all, or a arge part of said cross vibrations will be eliminated or converted into directwaves, and my invention consists in the features hereinafter set forth and claimed.

Reference is hereby made to the accompanying drawing in which Figure 1 is a plan view of a crforated sheet of metal which may be used in the construction of one form of my invention. Fig. 2 is a plan view of a similar sheet which may be used in constructing another form of my invention. Fig. 3 is an end view showing how the sheet of Fi 2 may be formed into concentric tubes. ig. 4 is an elevation of a tone purifier embodying my invention. Fig. 5 is a detail view of one of the tubes of Fi 4. Fig. 6 is a detail view of another tube of Fig 4. Fig. 7 is a section on line 77, Fig. 4. Fig. 8 is a section on line 8, 8 of Fig. 7. Figs. 9, 10, 11 and 12 are similar to Fig. 4 and illustrate various modifications. .Fig. 13 is a vertical sectional view showing one form of my invention as applied to the reproducer and amplifying horn of a phonograph. In all the views corresponding parts are indicated by the same reference numerals.

My invention in its simplest form-comprises a single tube which may be formed from the Sheet 1, Fig. 1, or which may be the tube 1 of Fig. 4, 1 of Fig. 9, 1 of Fig. 10 1 of Fig. 11, or 1 of Fig-12. The walls 0 the tube are provided with apertures or perforations 2, 2, 2", 2 and 2 respectively. This tube should be used in connection with an amplifying horn, being inserted and held in the small end of the horn 3, the said horn being connected by the usual flexible tube 4 to the reproducer 5 of a phonograph or other talking machine or when it is desired to pro' duce a record to the recorder'of a similar instrument. The end of the tube which is farthest from the reproducer is preferably closed, althou h it may be partly open or entirely open; 3 have found, however, that superior results are secured by the use of a cured together concentricall the walls of each of the tubes being pe orated and the .s aces between-the tubes forming channels.

hus I may usethree tubes, 1, 6, and (see Figs. 4 to 8). The tube 6 is placed within the tube 1 and the tube 7 is placed within the tube 6, thus forming'three channels 8, 9 and by a wall 11. at the end farthest from the reproducer and closed at the o posite end, as by. a wall 12,' andthe channel 10. In order to secure the best results the channel 8 should be open at the end nearest the reproducer andclosed at the opposite end The channelgshould be open symmetry, but I prefer to-make them of di- .site ends as previously described. -I

verse shapes and sizes and arranged without regularity or symmetry, as I have obtained superior results in the latter case.

t should be. noted that the tube 6 is shorter than'the tube 1 and the tube 7 is shorter than the tube 6. In some cases only two tubes can be used, namely, the tubes 16 and 17 of Fi 3. If desired, the number of concentric tu bes may be increased the tubes being arranged in each case concentrically and with adjacent channels closed at o poave constructed in this manner tone purifiers consisting of as high asseven tubes and have secured excellent results therefrom, but for ordinary urposes three'tubes, as shown in Fig. 8 wil suffice.

A multitubular device of the character de-" scribed may be constructed from a single sheet of metal by cutting it to the proper shape, perforating the same and then rolling it into tubes beginning always with the smallest. Thus in Fig. 2 a sheet consisting of sections 16, 17 and 18 is perforated as shown. The section 17 is then rolled into tubular form and soldered (see Fig. 3). The section 18 is bent away from the tube 17 and the section 16 is then rolled 'or bent into tubularform and soldered, the section 18 forming a web by which the sections are held together..

The channel endsmaybe closed as eachtube is formed. Obviously any number of concentric tubes can be produced in this manner.

The device of Fig. 9 is similar to that. of

Fig. 4, except that the distance of the apertures 2 from the lower end of the tube 1 is greater than the distance of the apertures I 2 from the lower end of the tube 1. Both devices are, however, so situated with respect to the amplifying horn 3 thatjthellowest aperture occurs at the point where the,

, tively. Y

' The device of-Fig. 11 consists of a single tube 1. This tube may be used in connection with other tubes if desired. That is, it

' may replace the tube 1 of Fig. 4. One of the apertures 2 consists of a spiral making one complete turn about the axisof the tube as shown.

In. Fig. 12 the tube 1 is composed of two sections, a cylindrical section 1" and a bulb 1. tube 6 and within the tube 6 is a similarly shaped tube 7. The channel between 1 andfi is closed by a wall 11; the channel between 6 and 7 is closed by reason of the two sections being joined together at 12;

and the channel formed by the tube 7 d is closed by a wall 13 I and 12 are adapted by reason of the enlarged portions 1 and 1 respectively to engage the Within the tube 1 is a similarly shaped The devices of Figs. 10

tapering portion of the wall of a horn, as in- I .dicated in Fig. 12 and may be so used.

As previously stated, the tone purifier should be held in the small part of the ampli- Sy'ing horn, but this does not mean that the evice must be located at the very narrowest part of the horn as shown in 'F1g.,13,; they may be held at'some distance therefrom, in any ortion of the horn the area of which is smal as compared with the outlet of the horn. Furthermore, two or even more of the devices may be used in a single horn, being laced at intervals along its length.

Wit the tone purifier placed in the amplifying horn 3 and connected to the phonograph reproducer 5, I have discovered by ex: periment that the quality of tones given out y the instrument are greatly superior to the tones produced when the tone urifier is-absent. My theory of the operatlon of the de-' i verte into a direct wave by the tone purifier. 'It will be noted that the relative arrangement of parts is such that practically all the direct waves or vibrations pass through the tone purifier as indicated by the line 0, indicating the path of such wave, and I know by experiment, that the volume of Thus I have in-.

sound is not diminished to the slightest de gree b the use of the device described. On the ot er hand, the character of the woody tone of clarinets, oboes, of the singing tone of violins, cellos, etc., and the brassy tone-0f cornets, etc. are, made more natural by the use of my invention, and as a result in the reproduction of band playing or orchestral music, the. tone of eac easily distinguished and more pleasing to the ear.

. My invention is also capable of use in other forms of phonic apparatus, such as Stethoscopes, telephonic transmitters and receivers, etc. for the purpose of purifying the tones thereof. The relative'lengths and diameters ofv the tubes may of course be varied to suit the articular requirementsof the instruments ast named.

Havingnow described my invention, what I claim as-new and desire to secure by Letters Patent, is as follows:'

. 1. As a new article ofmanufacture, atone purifier consisting of a plurality of concentric tubes secured together and forming channels, adjacent channels being closed at opposite ends, substantially as set forth.

2. As a new articleof manufacture, a tone purifier consisting of-aplurality of'hollow members of difierent'diameter secured together one within another and forming channels, adjacent channels being closed at oppo i site ends, substantially as set forth.

3. As a new article of manufacture, a tone purifier consisting of aplurality of concen-' tric tubessecured together, the walls of said tubes being provided withapertures, substantially as set forth) 4. As a new article of manufacture, a tone purifierconsisting of a plurality of hollow members of different diameter secured to-.

gether one Within another, the walls of said members being provided with apertures, substantially as set forth.-

5. In a phonograph ortalking machine, the combination with a re roducer or recorder and an amplifying cm, of a .tone

urifier situated within thesmall end of said cm and comprising a tube, the side walls of which are provided with apertures, substantially as set forth.

instrument is more- 6. In a phonograph or talking machine, the combination with a reproducer or recorder and an amplifying horn, of a tone purifier situated within the small end of said horn and comprising a tube the side walls of which are provided with apertures and which is closed in an axial direction, substantially at set forth.

7. In' a phonograph or talking machine, the combination with a reproducer or recorder, and an am lifying horn, of a tone purifier situated wit 'n the small end of said horn and consisting of a plurality of concentric tubes secured together and forming channels, adjacent channels being closed at opposite ends, substantially as set forth.

8. In a phonograph or talking machine, the combination with areproducer or recorder, and an amplifying horn, .of a tone purifier situated within the small end of said 1 horn and consistin of a plurality of concentric tubes secure together and forming channels, the channel of greatest diameter being open at the end nearest the reproducer and closed at its opposite end, substantially as set forth.

9. In a phonograph or talking machine, the combination with a reproducer or recorder, and an amplifying horn, of a; tone purifier situated within the small end of said horn and consistin of 'a plurality of concentric tubes secure together and forming channels, adjacent channels being closed at opposite ends, and the channel of largest diameter bein open at the end nearest the reproducer, su stantially asset forth.

10. In a phonograph or talking machine, i

the combination with a reproducer or. re-' 

